There's so much that happens in the first season of 13 Reasons Why, that it's helpful — and maybe even necessary — to watch it a few times. Because the show jumps back and forth so much, you may have gotten confused about the order in which things actually happen. Each person on Hannah's tapes makes it on there for a very specific reason; one person is on there twice, and Clay, well Clay didn't actually do anything wrong. For clarity's sake, here's the shortlist of who corresponds to which tape, and why, before you dive into season two.
For taking the inappropriate picture of her on the slide then letting Bryce spread it around school.
For ending their friendship in favor of dating Jessica, and writing Hannah's name on "the list" at school.
For saying that the photo of them kissing is of Hannah and another girl, leading the guys to think she's easy.
For stealing the compliments and throwing away the note she had written him. (He doesn't actually throw it away, but Hannah doesn't realize that.)
For not helping her pursue her rapist, even though she didn't want to divulge his name at the time.